Chef Stan Frankenthaler of Boston's Salamander restaurant was one of the first chefs in America to remove threatened seafood species from his menu. In this episode, he heads out for an adventure on the high seas in search of the giant bluefin tuna with harpooner Billy " Bluefin" Chaprales. They are harpooning not because it is archaic, but because it is the most sustainable modern method for preserving the most sought-after fish in the sea. Recipes: Raw Tuna & Green Goddess Summer Salad; Seared Tuna & Savory Sauce; Blueberry-Ginger Ice Cream Glaze.